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REM sleep typically occupies 20â25% of total sleep in adult humans: about 90â120 minutes of a night's sleep. The first REM episode occurs about 70 minutes after falling asleep. Cycles of about 90 minutes each follow, with each cycle including a larger proportion of REM sleep.
There is not enough time spent in REM for most people so the cycle is tough to adapt to. The cycle consists of 4 x 30 minute sleeps throughout the day which totals only 2 hours of sleep! Some have adjusted the cycle to reflect a pattern of one 1.5 hour sleep with 2 x 30 minute naps and one 20 minute nap. Read more.